Space-charge sheath with ions accelerated into the plasma
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/4536 |
Resumo: | The conventional model of near-cathode space-charge sheath with ions entering the sheath from the quasi-neutral plasma may not be applicable to discharges burning in cathode vapour, e.g. vacuum arcs, where ionization of emitted atoms may occur inside the sheath with some of the produced ions returning to the cathode and others moving into the plasma. In this connection, a simple model is considered of a sheath formed by electrons and positive ions injected into the sheath with a very low velocity and moving from the sheath into the plasma. It is shown that such a sheath is possible provided that the sheath voltage is equal to or exceeds approximately 1.256kTe/e. This limitation is due to the space charge in the sheath and is in this sense analogous to the limitation of ion current in a vacuum diode expressed by the Child–Langmuir law. The ions leave the sheath and enter the plasma with a velocity equal to or exceeding approximately 1.585uB. |
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Space-charge sheath with ions accelerated into the plasmaSpace-charge sheathIonsPlasma.Faculdade de Ciências Extas e da EngenhariaThe conventional model of near-cathode space-charge sheath with ions entering the sheath from the quasi-neutral plasma may not be applicable to discharges burning in cathode vapour, e.g. vacuum arcs, where ionization of emitted atoms may occur inside the sheath with some of the produced ions returning to the cathode and others moving into the plasma. In this connection, a simple model is considered of a sheath formed by electrons and positive ions injected into the sheath with a very low velocity and moving from the sheath into the plasma. It is shown that such a sheath is possible provided that the sheath voltage is equal to or exceeds approximately 1.256kTe/e. This limitation is due to the space charge in the sheath and is in this sense analogous to the limitation of ion current in a vacuum diode expressed by the Child–Langmuir law. The ions leave the sheath and enter the plasma with a velocity equal to or exceeding approximately 1.585uB.IOP PublishingDigitUMaBenilov, M. S.2022-08-31T13:57:38Z2010-01-01T00:00:00Z2010-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/4536engBenilov, M. S. (2010). Space-charge sheath with ions accelerated into the plasma. Journal of Physics D: Applied Physics, 43(17), 175203. DOI: 10.1088/0022-3727/43/17/17520310.1088/0022-3727/43/17/175203info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-05T12:57:52Zoai:digituma.uma.pt:10400.13/4536Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:08:39.898016Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Space-charge sheath with ions accelerated into the plasma |
title |
Space-charge sheath with ions accelerated into the plasma |
spellingShingle |
Space-charge sheath with ions accelerated into the plasma Benilov, M. S. Space-charge sheath Ions Plasma . Faculdade de Ciências Extas e da Engenharia |
title_short |
Space-charge sheath with ions accelerated into the plasma |
title_full |
Space-charge sheath with ions accelerated into the plasma |
title_fullStr |
Space-charge sheath with ions accelerated into the plasma |
title_full_unstemmed |
Space-charge sheath with ions accelerated into the plasma |
title_sort |
Space-charge sheath with ions accelerated into the plasma |
author |
Benilov, M. S. |
author_facet |
Benilov, M. S. |
author_role |
author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Benilov, M. S. |
dc.subject.por.fl_str_mv |
Space-charge sheath Ions Plasma . Faculdade de Ciências Extas e da Engenharia |
topic |
Space-charge sheath Ions Plasma . Faculdade de Ciências Extas e da Engenharia |
description |
The conventional model of near-cathode space-charge sheath with ions entering the sheath from the quasi-neutral plasma may not be applicable to discharges burning in cathode vapour, e.g. vacuum arcs, where ionization of emitted atoms may occur inside the sheath with some of the produced ions returning to the cathode and others moving into the plasma. In this connection, a simple model is considered of a sheath formed by electrons and positive ions injected into the sheath with a very low velocity and moving from the sheath into the plasma. It is shown that such a sheath is possible provided that the sheath voltage is equal to or exceeds approximately 1.256kTe/e. This limitation is due to the space charge in the sheath and is in this sense analogous to the limitation of ion current in a vacuum diode expressed by the Child–Langmuir law. The ions leave the sheath and enter the plasma with a velocity equal to or exceeding approximately 1.585uB. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-01-01T00:00:00Z 2010-01-01T00:00:00Z 2022-08-31T13:57:38Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.13/4536 |
url |
http://hdl.handle.net/10400.13/4536 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Benilov, M. S. (2010). Space-charge sheath with ions accelerated into the plasma. Journal of Physics D: Applied Physics, 43(17), 175203. DOI: 10.1088/0022-3727/43/17/175203 10.1088/0022-3727/43/17/175203 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
IOP Publishing |
publisher.none.fl_str_mv |
IOP Publishing |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799129954761310208 |